CVSS 4.0
9.3 criticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NCVE-2026-54088
Critical (9.3). EPSS 0.8% chance of exploitation in the next 30 days. Fixed in github.com/filebrowser/filebrowser/v2 2.63.6.
File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.6, the Hook Authentication feature in File Browser allows administrators to delegate login verification to an external shell command. User-supplied credentials (username and password) are interpolated into this command string using os.Expand without sanitization. An unauthenticated remote attacker can inject shell metacharacters in the username or password field at the login screen, causing the server to execute arbitrary OS commands before any authentication takes place. This is a critical pre-authentication RCE. This vulnerability is fixed in 2.63.6.
Severity
- EPSS
- 0.8% chance of exploitation in the next 30 days; higher than 55% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-78, CWE-88, CWE-306
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-m93h-4hw7-5qcm | Go | github.com/filebrowser/filebrowser/v2 | <2.63.6 | 2.63.6 |
| GO-2026-5962 | Go | github.com/filebrowser/filebrowser | all versions | no fix published |
| GO-2026-5962 | Go | github.com/filebrowser/filebrowser/v2 | <2.63.6 | 2.63.6 |